Sheet metal nails with coated heads

Abstract

Sheet metal fasteners and/or washers of the type which are used to fasten membranes to cementitious materials of a type such as utilized in roofing wherein the fasteners are treated to provide a corrosion resistant coating to the washers and those portions of the fasteners not inserted into the cementitious material.

We claim: 
     
       1. In sheet metal fasteners including galvanized sheet metal fasteners for attaching to a cementitious material wherein the fastener includes a metallic shank portion and a head portion, the improvement comprising, a non-metallic coating material layer covering said head portion, said coating material layer formed of a corrosion resistant material and at least a substantial portion of the shank portion being free of said non-metallic coating material layer whereby said metallic shank portion may chemically bond with the cementitious material when the 
     
     
       2. The fastener of claim 1 in which the head portion includes upper and lower surfaces, said coating material layer covering said upper and lower surfaces of said head portion. 
     
     
       3. The fastener of claim 2 including a washer means having an opening therethrough through which the shank portion of the fastener extends, said washer means having a diameter greater than the head portion of the fastener, said washer means having upper and lower surfaces, and a corrosion resistant coating material layer covering said upper and lower surfaces of said washer means. 
     
     
       4. The fastener of claim 3 in which said coating material layer is selected from a group of materials consisting of urethanes and polypropylenes. 
     
     
       5. The fastener of claim 2 in which said coating material layer is selected from a group of materials consisting of urethanes and polypropylenes. 
     
     
       6. The Sheet metal fastener of claim 1 wherein said coating material layer is a tape or film. 
     
     
       7. In a galvanized sheet metal fastener for attaching to a cementitious material wherein the fastener includes a shank portion and a head portion having upper and lower surfaces the improvement comprising, a supplemental non-metallic coating material layer covering said upper and lower surfaces of said head portion, said supplemental coating material layer formed of a corrosion resistant material, and at least a substantial portion of the shank portion being free of said supplemental coating material layer whereby said shank portion may chemically bond with the cementitious material when the fastener is applied thereto. 
     
     
       8. The galvanized fastener of claim 7 including a washer means having an opening therethrough through which the shank portion of the fastener extends, said washer means having a diameter greater than the head portion of the fastener, said washer means having upper and lower surfaces, and a corrosion resistant coating material layer covering said upper and lower surfaces of said washer means. 
     
     
       9. The galvanized fastener of claim 8 in which said supplemental coating material layers are selected from a group of materials consisting of urethanes and polypropylenes.